Pattern wafer



FIG. 1 is a front elevational view of a pattern wafer, showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an enlarged front portion view taken along line 7-7 in FIG. 1;

FIG. 8 is an enlarged bottom portion view taken along line 8-8 in FIG. 6; and,

FIG. 9 is a top perspective view of FIG. 7. 

CLAIM The ornamental design for a pattern wafer, as shown and described. 